Hi Mick Trevor I made up some of these last year as I have a mould for a 250g speed jig. The advice was to use dynema core. Which is very pricey, so I popped in to see Pete at Quay West and bought his cord for a few pence. It has a ridiculous breaking strain. Heat shrink in red from internet Hooks were bought from UK Hooks Octopus and tournament, although not advertised as stainless they do not seem to rust or tarnish ALso bought hooks and tube to make gummy macs. Can not say I have had a huge success, I could have invested the money in sidewinders and caught more, but then again I would rather fish flying colar style than go pirking. Dave and his crew on White Magic do very well on pirks, with or without gummy macs Hope that this helps Charlie